a-a a-i aaa aad aaf aai aas aax ad- ada add adf adi ads adx af- afa afd aff afi afs afx ai- aia aid aif aii ais aix as- asa asd asf asi ass asx ax- axa axi axs axx daa dad daf dai das dax dda ddd ddf ddi dds ddx dfa dfd dff dfi dfs dfx di- dia did dif dii dis dix dsa dsd dsf dsi dss dsx dxd dxi dxs dxx faa fad faf fai fas fax fda fdd fdf fdi fds fdx ffa ffd fff ffi ffs ffx fia fid fif fii fis fix fsa fsd fsf fsi fss fsx fxi fxs fxx i-d i-f ia- iaa iad iaf iai ias ida idd idf idi ids idx ifa ifd iff ifi ifs ifx iia iid iif iii iis iix is- isa isd isf isi iss ixi saa sad saf sai sas sax sda sdd sdf sdi sds sfa sfd sff sfi sfs sfx sia sid sif sii sis six ss- ssa ssd ssf ssi sss ssx sxi sxs xaa xad xaf xas xda xdf xdi xds xfa xfs xfx xia xii xis xix xsa xsi xss xxi xxx